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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77df67e1373fb54a9fed4de98a85be6c8c5f4360d3badaa1de6bec68cc112ffe' 
  AND token = 'PbZnuxQOE+IiGhW2JF+4BqCprrry8vncnix8NowUi60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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