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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed98e3e2c673284b644f044c1c2c9578ef4c636a318202ad9fa22b733ad8a409' 
  AND token = '4cSnsZBjcTX7VWHFlUV2JvwmkyDK7n5fcsyclHzY5Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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