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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3464ce2cf7e740d884304c7f38a36ac2f982bbfb892efeb4b6d53f1264ee45e2' 
  AND token = 'Ab24htmQFJzCuJ7mT4mOz7+8L0K3Ju3cAeKzTI+lX0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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