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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d956d5f59921194097e467d5b760a0a33cb4eb85dc26512d91b6ec10767211' 
  AND token = 'nzmW1pUqOiVGwNomea8P4bflpmgVQVzNnB9YZC5ziGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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