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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afb9e88007073f1e612eae83ee0a9d5b99d266aae15af816a0ac45d40512de0' 
  AND token = 'kTzVYR+7SecL3k3jWf33kVZpRNInue+JiDPZoHKDqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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