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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ebb1ec1b581c95b9e19cde93c12171bf0edf91a007c6398cb554c5e43d3dc2' 
  AND token = 'KIpF24+n9d8VbJXMGEu+hzXYpC//CDkQSQWKVdcOlb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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