Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e348fdf003b188887769c1e46ab7eed00fb45684bd4e81e9df7d7673e0a1e83' 
  AND token = 'z5exfDG++PeNPyFGI/1CFu9bxeXb3bCrcKXDrbzN5GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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