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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce649a3620b3ec3754ea49c0b73b89dbe8c639ed0f76a68746a55be613b334d' 
  AND token = '/o/N4dfkUpTd2XAEH+HrahnlPtYBuSpxQxPm4OuIO3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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