SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59be2826e9158cf7ad867d3615c267424266d35ae1db2e7f22da61978196cdb' 
  AND token = 'YOuenjVWZ4sxvYd3JZJdQt+jZ4sF/uz5y9VT5PTDVSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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