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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc3436c8918cfafad9619a88b60e7db4ebe10eb0f010d9730bd0bdf83dcef2e' 
  AND token = 'B4C/QjcHrH6y5TBApZ/s8mOoiLWNLhS1EjIwhtQA9N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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