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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c43ea41654a690da9eb592164b55c285c69b6e1a444693c6a93ebced6486982' 
  AND token = 'nmMUEvKCb97PpC9jSHOTZegPpHAFcv2KVucQozYAH68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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