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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5209c9ec95a9f21e092a00210e9c45a4b57b7375c7be0a905640db5e113fd922' 
  AND token = 'ayPEPSsZ1k6ZiJZI/q9Ta4Hni6aQqx8DboKmpMMN+yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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