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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462faa42e5c35b56e6a7bbd4cb8ff82a68f465f2b15df2d8a19a6c281c412f68' 
  AND token = 'J0q++FdDOMf2nCsGoxxKxFB/68NFCjF7tDwNcpN26QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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