SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af13a0fc95852a59565d465e7e993fb5f898e41e3675f120b898d3ac1576683d' 
  AND token = 'hx8YNyV+5EDm/24k0scmCuBq4Ri7iKHgJI9V9+YGC9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}