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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601682d7838efe8a44ca1b9679b9ae9326dc2d95f1998017cb42160dacfd339a' 
  AND token = 'yy2jRyr212zjGJTI3AWR9+uxgSos6U18BgkruqqCmdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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