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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79b2851feb35ba4f1fc80c822bc22b765daaa01e3693e67c30a3725ea89b48b' 
  AND token = 'FhfMGGe/tMDpmf8NeBcUnOCZ+LyaW2wDToHpC+Y4qUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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