SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2501a1f5748c71f76f5b68f034b052123d7a4f5e77e60b44f1b8813aebd960' 
  AND token = '7B0FVhm9RNsrfzImvsgGY4ZZHBwBZRqKPt098kMbgZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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