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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1759f5a6257ba7e8637647c361d57af4c26d5538bf680b84296d6078a1f81fb' 
  AND token = 'c8qCCe+vBfotvolCh8cWdd6g7h4WWfCHjsiICt1FUK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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