SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef647538fd2c2306e98e6029b1bd8043bf74ba6a9ca67c892539626e07c5d6b' 
  AND token = 'H4A9WPQnkQKt7XLVY+gwpKv4viF/4vNn8wBMZsFZ/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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