SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30966465b9010a29a26dc56f69a4c9d9af2aeb4cf2a72fff083fc4488f250cc7' 
  AND token = 'ZHgKqsxoPmhRSlxRimdJTgj2FzyEPmp//tc3AHHcBOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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