Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d277a88caeeaef6463b1c8495a696c1cdab4712aa3a6b9ccd567a4fb85ac2a9' 
  AND token = 'HK4k5DQhPuqza4MCrHeXDKHQ5dpVFuDiej7eGiziPKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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