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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c313ae9a919cb577a48b6bec8330a643c90810dcaac943fbb075dc57f7c9affd' 
  AND token = 'bgSm91oKc5BlzlmADArnx4ZiPLaWf3SyHmlAGdlNI6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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