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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0718d5ff6ac98364d8e6efea569e3b27ce5efa1f1294af31bccee1e58f7ef1ea' 
  AND token = 'IvkHIWLnbK+6EcNdimV79alRmy2jNHf2kTP47ZM1kOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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