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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172e879ced114e44e2fd5d8ad0eeb1a6b6e534a2bd762993993704ffb4031f93' 
  AND token = 'L3jORNEw58CgL3omead2LMQT/rIPrv8tVam2FFyhgTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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