Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38c3f7fbdf774598c48de8d5e022a44a2c5e62e9f6b6d899f7742ff573d0427' 
  AND token = 'l54ddiRm3aBDuP58TI3i76xChNZDFlXj2mIEyGns2pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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