SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ba5992abd58dc61abf0972f2d03d43f308d09c69080a96e58ae1b9e8834f9b' 
  AND token = '+KCODRnvyreN7um9jhqhqNDs6g9L1oCLZFJhUh6l4ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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