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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62797e3f571bce5e96231f199b44e8b8cfe54fffae77975c142e5f545eed7a36' 
  AND token = 'r2R9q460PERrARoW6+SYdJ7Q6qelkFRvpGU40bFrIwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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