Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9bf3295856dd3460181ddf19e014e42480ac270aaa8e4c9513f4f9bed30407' 
  AND token = 's4zsjafTjw+4dIcyAETneadTNZtx63xE9l66YlZEo7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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