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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc98d6104c01f84583ae2ff384109159e1bc7328991fb2dcd59b3aa17837a6a' 
  AND token = 'k0n9xNFL5IC0pSX5dTWhVn6c0VqsBWtEX5DNRTFbjOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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