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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49686d019a950a72908f3ad859b06d8991691f3914ba697c91dc299d432ba5fc' 
  AND token = 'ptLP4+l9DzygbEn5fr6GOPH6etVLHMyambTZKDLnA7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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