SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1683e975ab36e634a65c6c5ec69665fced9078a2d175247e4ca4a3b78de18923' 
  AND token = 'SuJVKG0kh9vbYCpC52+JK3RUuoe+YL8D71H+HQO1wXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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