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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8056319ac935cbacc2a543f63c6f19edacbcffb07008c6a2f1b31b02e0c48b2' 
  AND token = '0toytD3/gDjdWeCvt5orbyaDKSn+C8VkkjoL8/MVnpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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