SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b27a8f41bf081ba72beb28a5696cf5e1431292528a676be16c785ee2fba35bc' 
  AND token = '/qGOKaKsI34VTOJIjN+ydLwWhnTwErrCSnOhBPmye04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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