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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cfa583ab8b71ed6c56ebc5ebfa5de8a502dfd3a1a935f7e5ff6f80cff0227ba' 
  AND token = '8jowjLcWad4nbLZTAkp7T9Yr8YKyBZNdi31Ye0zYfgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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