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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4feaf316f3951ddb9ca1d691010379c4a12d856ef26c4314a4267e8d6ddd5bf9' 
  AND token = 'RBS3NCchtMs1wbOgLo36GjUafunxpKWXgGET0YgSZrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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