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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13738e9266baef2570873dc68b40b1f429c823b5b14f45d3c2496432b63a6fe6' 
  AND token = 'On1zVudbVmi9cTQUlwT2kXNV3RT1CrYfm7VBGV9ZkiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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