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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d7bef50ac683d369a1513dc8c79e32ba74580c5f7fa89388c9785a4f63444ee' 
  AND token = 'uBt9RBpA9TVPQ6VOeFtxpF54Y2udpa7l5aA2HyA3AZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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