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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc434567de06eb8884653de1f1cf8af1fc457fdfbf7f73065c949a4df1d00f0' 
  AND token = 's1IZUIt4iZjd2d8oj983x37IchHDlFcAgyTyn/r7vgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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