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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8230cff037b383bf5706f8823dd33a95c41cee4d9fcc4d0ebbb6ca3440b6af' 
  AND token = 'YUm2yduOSVVvabOo8UjXquRB7d0VYfMd4P7h3KK3Zhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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