SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f09b2e1b9f86ae51acc871fde5b713f6ad03d413b836004645691cd3c0c5ee' 
  AND token = 'EfjKvsPxOM6SWqX3VqYxqhhHBnfKwohIg1AHcS6pDDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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