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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330578d5d1af33746633ebdeec5c6576bf0c89eef33a151faae83ac6f4aa675c' 
  AND token = 'rWvaC/e4WZCNrrMWhV/sUVQl70EHvZIqT4mUVCFGGQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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