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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a117be6ec94ea3744ac187b25a73f78a35d79789801b7cf75768aebeaa0d73' 
  AND token = 'Gu1RB0TL2QQTFPkjn6ClKyC9Bj6KzKF0rTcGGmAWnuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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