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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f09048fe9473013b5f963eb8a1241def36c3ce4929793ed3c7f8baced76adb' 
  AND token = '7wXS0t/Z/DlR9j59a/F/oQMNvhJyAeTnofVK2wQH3UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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