SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1daf6566043d7702f5f5540353899205d534e42e69b23c9509bb37b9f5d6bc90' 
  AND token = 'J6kBRCnpKM5wKO/HmNlYN0CWHvPCP2F8ivmi3szqx1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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