SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53ea3aca04de3cd24b665655fffabe776c3fd9c3241515a748978c2cc53ebe8' 
  AND token = 'jq/zhbwBteF0OX0lYXDR7fPrWS+mnxGtvHcn2DFD6ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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