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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19e1fd2f03b960e139b6f8f9d27b52d1f09df85eb7d3ec8c5b9c23fb7a83967' 
  AND token = 'eGKyLN7THr7of+jqwNkFpTar4OguUWCkffvqztu2nJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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