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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13cd998867a44d6d19500c15b7e7fe7418d7910ffe759d98cd3a217cec98c6c' 
  AND token = 'AcCOFUZZtIr8adHcwT+DycF4nzJ6lmeoJDhLS/J9Sw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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