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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f531d8ced94a0fcc285055ab7d0da31f88ea07f70acb3aba8c9cf17a23311e' 
  AND token = 'e/jxnhLhPatCEnQd5GaJVdDOo6fFMOm9UmEt97iVvGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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