QUERY PLAN
Seq Scan on tbl_user_visit_clients (cost=0.00..21.90 rows=1 width=12)
Filter: ((user_id IS NULL) AND (client_id = ANY ('{1661,146,982,2538,2616,1933,3081,3372,3364,3344,3334,3327,3311,3304,3301,3296,3286,3278,3009,2845}'::integer[])))