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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc73a97c6eaa9ed8be497b971fbf64000af26ec466bac3b9a677fe30ab69b5c' 
  AND token = 'Q44agvn+PHsoQx6c4x6kQbbHQ+eC5tIriMEy9/vs5RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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