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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9412cab6fb7a818830f326543c7c7d39a14c5b646c044dc684fe5b5cb4e94cc9' 
  AND token = 'VGQ5iJX7BCj9aXErJC7tmgOYANBRj51pHx3nBd0nyEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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