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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94084ccc9671f2ce763308f0f720b4c85f88562c98a3437a7e9f1cf18356214a' 
  AND token = 'aC2m5jpJvFk+4UPXHBOg/TxIAW3h6dtU1rw7u5eXn04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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