Eager load subscription associations

ee/app/models/gitlab_subscription.rb

@@ -24,6 +24,8 @@ class GitlabSubscription < ApplicationRecord
     with_hosted_plan(Plan::PAID_HOSTED_PLANS)
   end
 
+  scope :preload_for_refresh_seat, -> { preload([{ namespace: :route }, :hosted_plan]) }
+
   DAYS_AFTER_EXPIRATION_BEFORE_REMOVING_FROM_INDEX = 7
 
   # We set a 7 days as the threshold for expiration before removing them from

ee/app/workers/update_max_seats_used_for_gitlab_com_subscriptions_worker.rb

@@ -12,7 +12,7 @@ class UpdateMaxSeatsUsedForGitlabComSubscriptionsWorker # rubocop:disable Scalab
     return if ::Gitlab::Database.read_only?
     return unless ::Gitlab::CurrentSettings.should_check_namespace_plan?
 
-    GitlabSubscription.with_a_paid_hosted_plan.find_in_batches(batch_size: 100) do |subscriptions|
+    GitlabSubscription.with_a_paid_hosted_plan.preload_for_refresh_seat.find_in_batches(batch_size: 100) do |subscriptions|
       tuples = []
 
       subscriptions.each do |subscription|