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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156130fe0c40a146a666a19e5e4f8eaa12d4839e6bf381d3b18719cf10b7c5b9' 
  AND token = 'iHybXkLTz1giiiSyBQq/+ZpPkg6RrP8OVvcDE3vcCDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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