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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420e1b2de7988513c809e927745e88421db748d932c47c2349161ba96162d774' 
  AND token = 'DEf1shioC/gCHWSOw0oUyW15oTIhI4FlI3oil6rwx40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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