Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc609ad6cd3aeee6afbe46b1a89aead8141cbb9c26724d818b329e1a5a90c98' 
  AND token = 'MI0zaE7Akp/WqC6eeHJiJ8f/x9I2irs5Gw2ULXz5D3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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