SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da2bfe577f8fb499920fdca9811b1312748513d05977905992141e433bce22b' 
  AND token = 'qjL8XHvw5GITBFnMCC65lUiDzBr1U9xnhwN8jHS5P+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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