SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1493d7cc5aadd64d6095af1cbcd930d8c84b135a7b41a712b5c00948a92a55e' 
  AND token = 'kLpJSG7AhD62BR+TZCAyWzhKttldN4IjYYQgIgZ+7d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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