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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e31f5da65d726fdb57de364ffe98e7d047c9f5fb0d95cce5c9b200e90b80a7' 
  AND token = 'TNBu+Cfv4XoaqKMselBoxAjnH1QWBOGASV1YyWuY00s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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