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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979c0dfe4c706717be1583f379ebfe46a9d4895b925784b25e3fde804497565d' 
  AND token = 'RetY0zi2y/gRUJpUYpApSdLqHcQInnf30Cqtu5WhXgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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