SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ec3b2d0dae4d493d62d5a98b0b45632f27e541909e28c4092aff4787567054' 
  AND token = 'FXLy9w4dmCTIO8vXXwCfgbEhhRYGaqFKlafaJ8kSg+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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