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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b7ad5bf399ab6c61ffb506f83e60a73ca35e0d39ca6cfbee330796a23fd2db' 
  AND token = 'ByOxk3ZOnEwoqC0kVGq95smXdkcRk9Kggi7Harquc9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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