Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42bc872b7faac6c7328bc91436c78ced189e74221053f10d1c7575e8f0a19bfb' 
  AND token = 'mth48hp612K1ZsMQULpWtxEwkacli/HonzFAWqQGg2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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