Error 500 viewing /admin due to counting active users for license

This call is timing out in EE:License:

 User.active.excluding_guests.count

https://sentry.gitlab.net/gitlab/gitlabcom/issues/958951/

PG::QueryCanceled: ERROR:  canceling statement due to statement timeout

  active_record/connection_adapters/postgresql_adapter.rb:611:in `async_exec_params'
    @connection.exec_params(sql, type_casted_binds)
  active_record/connection_adapters/postgresql_adapter.rb:611:in `block (2 levels) in exec_no_cache'
    @connection.exec_params(sql, type_casted_binds)
  active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
    yield
  active_support/concurrency/share_lock.rb:187:in `yield_shares'
    yield
  active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
    @lock.yield_shares(compatible: [:load]) do
...
(200 additional frame(s) were not displayed)

ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
: SELECT COUNT(DISTINCT "users"."id") FROM "users" INNER JOIN "members" ON "members"."user_id" = "users"."id" WHERE ("users"."state" IN ('active')) AND (ghost IS NOT TRUE) AND "users"."bot_type" IS NULL AND (members.access_level > 10)
ActionView::Template::Error: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
: SELECT COUNT(DISTINCT "users"."id") FROM "users" INNER JOIN "members" ON "members"."user_id" = "users"."id" WHERE ("users"."state" IN ('active')) AND (ghost IS NOT TRUE) AND "users"."bot_type" IS NULL AND (members.access_level > 10)

ActionView::Template::Error: PG::QueryCanceled: ERROR:  canceling statement due to statement timeout
: SELECT COUNT(DISTINCT "users"."id") FROM "users" INNER JOIN "members" ON "members"."user_id" = "users"."id" WHERE ("users"."state" IN ('active')) AND (ghost IS NOT TRUE) AND "users"."bot_type" IS NULL AND (members.access_level > 10)

EXPLAIN ANALYZE:

                                                                             QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=1409088.01..1409088.02 rows=1 width=8) (actual time=46454.311..46454.312 rows=1 loops=1)
   ->  Merge Join  (cost=1.32..1378616.21 rows=12188717 width=4) (actual time=0.016..43440.790 rows=12191476 loops=1)
         Merge Cond: (users.id = members.user_id)
         ->  Index Scan using users_pkey on users  (cost=0.43..494021.75 rows=4382501 width=4) (actual time=0.007..10185.784 rows=4383060 loops=1)
               Filter: ((ghost IS NOT TRUE) AND (bot_type IS NULL) AND ((state)::text = 'active'::text))
               Rows Removed by Filter: 57381
         ->  Index Scan using index_members_on_user_id on members  (cost=0.43..763200.68 rows=12349341 width=4) (actual time=0.007..29638.193 rows=12251605 loops=1)
               Filter: (access_level > 10)
               Rows Removed by Filter: 139378
 Planning time: 4.093 ms
 Execution time: 46454.419 ms
(11 rows)

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