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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddeb1ae5e2d4aacda0f06ff9d9f7817c7b8de2eb3927ba918f400a96014a93f' 
  AND token = 'dlA/zlotl2U6+k3MjJQPIZYNqSKpyjTcractH2wyJ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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