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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0d31e3d7e707380225638f7a41a7dd7459e81b9e41ed896909a4f9b232fa20' 
  AND token = '+BuXiOuiypHuJMvPb31Ps4TGHOWjnIiMj18CtlvTUe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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