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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc94e954982af61e8ae5bce80b99aa20a987067a7caefc9f7d4ea61fd31828a' 
  AND token = 'zrh6nZ4KQskEEnL6ssFDZ+7/TeEzkf5iDxaWVYiCaMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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