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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71878e4f6118176a3faeb8e261dcd1c7ccb769e30d4fb51a6d2c71d3906cc5a' 
  AND token = 'Cac55j8z2nOwvpn+/ICDBanSIA0vEzd3XPnxdffUDY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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