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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6104af22ad60ca657aec429c353417e0f80632709f9b3e266133696f7b0de038' 
  AND token = 'qWtNEzI88yjQPM+podaYKJLGknD5bcOdM6/9hGyvTAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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