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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4febe3c29c5815b0ca32ee9c071d75117437187fcb50b5307a85dbca55753cc7' 
  AND token = '732gdzC/SyHa8C70kNV73Ct8YPNRDFgvXfI7T2jaWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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