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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f4751f12cf80deaa1501371f3045a8bd7170d5459eb2f43873878bac2c8299' 
  AND token = 'CvOoa89WOUKdKYLvzH1d6P0BUbLAHn5BPT6R3zNRtJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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