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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1718d6929c19a3337f572c40d7e401c3c947ba408e1a02ddb48446a64ccae9e1' 
  AND token = '6z0BQm0IlkYoNiyD6CazG9FthTIW5wqW65TFDaPxS9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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